SKEW index... anyone use it

I note this from link:-

In practice the SKEW index has been a poor indicator of stock market volatility. Financial writer Charlie Bilello observed data from the biggest one-day falls in the S&P 500 and the SKEW Index preceding these falls. "Going back to 1990, none of the worst declines had a SKEW Index in the prior month that was within the top 5% of historical values. So, when actual tail risk was present, SKEW did not predict it," Bilello said.
 
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